CVE-2021-42785 is a critical buffer overflow vulnerability affecting TightVNC Viewer (tvnviewer.exe). A remote attacker can exploit this by sending a specially crafted FramebufferUpdate packet from a malicious VNC server, leading to arbitrary code execution on the client system. With a CVSS score of 9.8, this vulnerability is easily exploitable over the network with no user interaction required, allowing for complete compromise of confidentiality, integrity, and availability. Despite its high severity, there is currently no public exploit code available, no evidence of active exploitation, and minimal community discussion or media coverage.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
<= 2.8.59CPE matchmatch criteria | cpe:2.3:a:tightvnc:tightvnc:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.
Remediation records are not available for this CVE.